I understand why ENY exists, even if I don't really like it. Also, I'm really not too sure/convinced that it actually has much of an effect in it's purpose.
However, I like Bonz's idea about having a perk price for planes with a low ENY when there's a high limit. Perhaps for every ONE ENY between the value of whatever plane you want to fly, and the ENY's limit, the perk price would be twice that. Just a thought, to prevent ENY from being "useless".
<S>
Yossarian